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An unintended “potential incident” was found:

in ~3 % of all plans, during primary check

in ~½ % of all plans, during secondary check

Actual incidents = accidents:

in ~¼ % of cases

For each actual incident, ~14 potential incidents were found

through checking.

An incident frequency of 3% could be seen in a “typical clinic”.

From IAEA database of radiation incidents

Independent calculation checks 1998-2003 on 27830 charts/plans